| abstract |
Process for preparing perfluoro-1,3-butadiene, comprising the following steps:n A) preparation of fluoro-halo-butanes of formula:n nCF 2 Y I —CFY II —CFY II —CF 2 Y I (V)n in which Y I and Y II , which may be identical or different, may be H, Cl or Br, with the condition that Y I and Y II are not simultaneously hydrogen; starting with a chloroolefin having the formula:n nCY″Y═CY′Cl (II)n in which Y, Y′, Y″, which may be identical or different, are H, Cl or Br, with the condition that Y, Y′, Y″ are not simultaneously hydrogen; and performing the following steps: a fluorodimerization, and a fluorination with elemental fluorine, the order of the two steps also possibly being inverted, a dehalogenation or dehydrohalogenation step being performed between the two steps, n B) dehalogenation or dehydrohalogenation of the fluoro-halo compounds of formula (V) to give the compound perfluoro-1,3-butadiene. |